Fix mime type in pay system

abonapp/views.py

@@ -363,6 +363,9 @@ class AbonHomeUpdateView(UpdateView):
 def terminal_pay(request):
     from .pay_systems import allpay
     ret_text = allpay(request)
+    if isinstance(ret_text, HttpResponse):
+        return ret_text
+    else:
         return HttpResponse(ret_text)